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	1.	No cover image available Geology and petrology of volcán Ceboruco, Nayarit, Mexico : summary by Nelson, Stephen Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 91(11), part I, 1980, p. 639-643: : ill., carte Availability: No items available.
	2.	No cover image available Contemporaneous calc-alkaline and alkaline volcanism at Sanganguey Volcano, Nayarit, Mexico by Nelson, Stephen Livieres, Ricardo Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 97(7), 1986, p. 798-808: : carte, graph., tab., rés.(Angl) Availability: No items available.
	3.	No cover image available New age determinations of central Colorado plateau laccoliths, Utah : recognizing disturbed K-Ar systematics and re-evaluating tectonomagmatic relationships by Nelson, Stephen Davidson, Jon Sullivan, Kim Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 104(12), 1992, p. 1547-1560: : ill., carte, graph., tab. Availability: No items available.

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